[why] expand erb templates need a class to save context

[how] Context class provides a readable property @info, it will save the context required by erb, and a expand_erb method, it can expand a erb templates based on @info.

Signed-off-by: Xiao Shenwei xiaoshenwei96@163.com --- providers/lib/context.rb | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 providers/lib/context.rb

diff --git a/providers/lib/context.rb b/providers/lib/context.rb new file mode 100644 index 0000000..6f9f579 --- /dev/null +++ b/providers/lib/context.rb @@ -0,0 +1,35 @@ +# SPDX-License-Identifier: MulanPSL-2.0+ +# Copyright (c) 2020 Huawei Technologies Co., Ltd. All rights reserved. +# frozen_string_literal: true + +require 'erb' +require_relative "#{ENV['LKP_SRC']}/lib/hashugar" + +# saves the context required by expand erb templates +class Context + attr_reader :info + + def initialize(mac, hostname, queues) + @info = { + 'mac' => mac, + 'hostname' => hostname, + 'queues' => queues + } + end + + def merge!(hash) + @info.merge!(hash) + end + + # existing variables of @info, can be used by erb + # @info: { 'name' => 'xxx' } + # Templates: + # This is <%= name %> + # After expanding: + # This is xxx + def expand_erb(template, context_hash = {}) + @info.merge!(context_hash) + context = Hashugar.new(@info).instance_eval { binding } + ERB.new(template, nil, '%').result(context) + end +end